I have given this product to my husband since he was treated for lymphoma - two kinds - one was stage 4. Chemo about did him in. He has taken AHCC for over five years. The cancer doctor said recently he didn't ever want to see him again! This was wonderful news. I strongly feel AHCC contributed to his keeping cancer at bay for so long. Interestingly, I ran out last month and my husband went five days without it. He got a terrible cold! He hasn't had a cold for five years! Believe me, we will not run out of it again!